It depends on the quality of PSU and available connectors.
900W is odd number and often sign of some cheapass poor design. Most reliable brands do 850W and 1000W.
Recommended wattage is for entire system containing said card, not just card itself, also often inflated to count for every possible hardware configuration.

Originally posted by Rumpelcrutchskin:

It depends on the quality of PSU and available connectors.
900W is odd number and often sign of some cheapass poor design. Most reliable brands do 850W and 1000W.
Recommended wattage is for entire system containing said card, not just card itself, also often inflated to count for every possible hardware configuration.

That's what I guessed and seems that is the case.Thank you kind sir.

Originally posted by Rumpelcrutchskin:

It depends on the quality of PSU and available connectors.
900W is odd number and often sign of some cheapass poor design. Most reliable brands do 850W and 1000W.
Recommended wattage is for entire system containing said card, not just card itself, also often inflated to count for every possible hardware configuration.

you need to account for spikes as well

3050 = 170w, ti = 200w
https://www.nvidia.com/en-us/geforce/graphics-cards/30-series/rtx-3060-3060ti/

450w is too small for it
go for a 550+w psu for it as nvidia recommends

you can get by with a lower wattage psu if the cpu is very low, and little to no accessories

psu calcs are useless
take cpu + gpu tdp
add 100w for other components
and another 100w for overhead
to get a good guess as a minimum psu

170w gpu
150 for cpu (amd always double their tdp for max, intel says their max tdp now)
200 rest and overhead
= 520w min to be safe

its never good to run a psu above 90%, they make more heat and are less efficient
and can trip their safeties, if properly set, temp/ocp/opp, or just go out of spec and kill hardware
https://en.wikipedia.org/wiki/80_Plus

>GPUs exceed their TDP/TBP target in the short time (when measured in milliseconds).

When measured over a longer period of time, the RX 6600 hits its TBP of 132W. But when zoomed in and watched in short time intervals, the RX 6600's (or any other component) power consumption/ current fluctuates, depending on the workload.

Transient peak loads happen and in these short intervals, the power consumption can be much lower or higher than its stated TDP/TBP.
The RX 6600 is likely to consume close to 250W during transient peaks (within a short period of time).
Lower wattage PSUs won't be able to adjust to that energy demand in such a small period of time and the PC will just crash.

There are other components that use a lot of energy aswell, especially the CPU.

You can use a few online calculators to check the needed power.
Most of all, power goes to GPU and CPU. But also MB, RAM, Disks use it. Also other parts like fans and LEDs (LEDs not so much, but if you have a lot of them....).

https://pc-builds.com/power-supply-calculator/
https://www.newegg.com/tools/power-supply-calculator

Like said before, always leave a fair bit of "spare" load. If you leave in a hot climate and/or your house is hot, you might want to give some extra spare spare power. Fans will work harder thus the PSU will work harder and the room gets hotter... it's a mean cycle.

You want at least 100W headroom and take into account the monitor, memory, storage, etc... for the system total to get an idea of what rated PSU you will need plus take into consideration future upgrades and add-ons.

Are you going to split the SATA power? Would you want a hot-swap dock? Things like that.

https://pcpartpicker.com/list/

Also has estimated wattage and is reliable.

Originally posted by Julien, cut it out.:

When measured over a longer period of time, the RX 6600 hits its TBP of 132W.

Not when read out via Software (e.g. Afterburner).

RDNA 2 (RX 6XXXX) series doesn't report the entire card via software. That's why the RX 6600 never shows beyond 100W in Afterburner. AMD changed that with RDNA 3 (RX 7XXXX). Which was a bit unfortunate for the RX 7600. Look for any YouTube comparison of RX 6600 vs RX 7600. Every comment points out how how inefficient the 7600 as successor would be, as the extra ~30W of the rest of the card is now added up in the readout. :-D


I'm using a 170W TDP 3060 with a 400W PSU, btw. But:
- I've upgraded to the 3060 (prior a 1050 Ti), or else would have bought a different PSU
- It's a PSU from a reliable brand. GPU makers when recommending have to take into account the lowest of the low PSUs out there. Plus people having lots of devices
- I've undervolted the 3060 and also am running a very basic system (as to devices, just one SSD, occasionally a legacy SATA HDD connected, the GPU, that's pretty much it. The CPU is but a 65W TDP one too).

Nowadays the "sweet spot" is a good quality 850W.

(RTX 4090 and RTX 5090 require 1000W PSU but who buy those for gaming?)